squonk 47,318 #26 Posted 4 hours ago 1 hour ago, Blaine said: I’ve seen the air side clogged, with about 2 pounds of dog hair… Leaves, twigs, nuts, dog food! Share this post Link to post Share on other sites
CasaytheMann 172 #27 Posted 4 hours ago I'm curious as to how they determined the evap coil was clogged?? Once low side refrigerant is blocked, or restricted, suction pressure drops. Once suction pressure drops, there is not as much refrigerant for the compressor to pump, and the high side pressure drops too. Share this post Link to post Share on other sites
adsm08 4,770 #28 Posted 3 hours ago (edited) 1 hour ago, Blaine said: I’m still struggling to understand how anything would get inside the evaporator to clog it. I just threw about 813 silica beads at this expansion valve and not one of them made it through. Those are much larger than what is found in AC desiccant bags. The particle size is closer to sand. I have also flushed a fair amount of sand out of cooling systems in the last few years too. Edited 3 hours ago by adsm08 Share this post Link to post Share on other sites
Beap52 2,341 #29 Posted 2 hours ago It was the 4th compressor before we accepted and installed it on my pickup. The man who does my AC work dumps the oil out of the compressor so he can be assured it's correct. Two of the compressors had metal filings in them, one had already been opened (and possible installed due to dirt on fittings) He wasn't going to accept a compressor sitting unsealed on a shelf. Finally the 4th was acceptable to him but now, a couple of seasons later, it's clutch sounds loud to me. These came from a local parts house. I would think with the technology and machining abilities now available that even overseas production would result in better parts. Share this post Link to post Share on other sites
adsm08 4,770 #30 Posted 2 hours ago 9 minutes ago, Beap52 said: I would think with the technology and machining abilities now available that even overseas production would result in better parts. It doesn't matter how good the tech is if you give it to a 5 year old and pay them 10 cents a day. 1 Share this post Link to post Share on other sites
Blaine 194 #31 Posted 2 hours ago They are from an A/C desiccant bag. i have a 2008 Edge with the 3.5L v6 in my bay right now for a power steering pump. I took these pictures of the expansion valve location. If you look at that area you should be able to see witness marks around the vicinity to know if they actually swapped it out. That nut should have fresh socket marks on it. I don’t recall replacing one specifically on an Edge, but it’s deep in there, but it looks doable from the firewall side. Removing the plenum would make a lot more access room. Share this post Link to post Share on other sites
adsm08 4,770 #32 Posted 2 hours ago (edited) 13 minutes ago, Blaine said: I don’t recall replacing one specifically on an Edge, but it’s deep in there, but it looks doable from the firewall side. It is. Pull the intake and you have more room than you know what to do with. All the known drier failures I have ever seen put a sand-like material through the system. Edited 2 hours ago by adsm08 Share this post Link to post Share on other sites
adsm08 4,770 #33 Posted 2 hours ago (edited) 2 hours ago, CasaytheMann said: Once low side refrigerant is blocked, or restricted, suction pressure drops. Once suction pressure drops, there is not as much refrigerant for the compressor to pump, and the high side pressure drops too. No, not quite. You are correct up to the very last part. Once all the refrigerant is stuck on the high side, between the compressor and the restriction the high side pressure has exceeded the safety limit and if it doesn't blow of the safety release the computer shuts the compressor off. The pressure at that time is usually between 350 and 400 PSI. Edited 2 hours ago by adsm08 Share this post Link to post Share on other sites
